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import { assetProxyUtils, OrderStateUtils } from '@0xproject/order-utils';
import { SignedOrder } from '@0xproject/types';
import { BigNumber } from '@0xproject/utils';
import { ExchangeContract } from '../contract_wrappers/generated/exchange';
import { constants } from './constants';
import { ERC20Wrapper } from './erc20_wrapper';
import { SimpleERC20BalanceAndProxyAllowanceFetcher } from './simple_erc20_balance_and_allowance_fetcher';
import { SimpleOrderFilledCancelledFetcher } from './simple_filled_cancelled_fetcher';
export class OrderInfoUtils {
private _orderStateUtils: OrderStateUtils;
private _erc20Wrapper: ERC20Wrapper;
constructor(exchangeContract: ExchangeContract, erc20Wrapper: ERC20Wrapper, zrxAddress: string) {
this._erc20Wrapper = erc20Wrapper;
const simpleOrderFilledCancelledFetcher = new SimpleOrderFilledCancelledFetcher(exchangeContract, zrxAddress);
const simpleERC20BalanceAndProxyAllowanceFetcher = new SimpleERC20BalanceAndProxyAllowanceFetcher(erc20Wrapper);
this._orderStateUtils = new OrderStateUtils(
simpleERC20BalanceAndProxyAllowanceFetcher,
simpleOrderFilledCancelledFetcher,
);
}
public async getFillableTakerAssetAmountAsync(signedOrder: SignedOrder, takerAddress: string): Promise<BigNumber> {
const orderRelevantState = await this._orderStateUtils.getOrderRelevantStateAsync(signedOrder);
console.log('orderRelevantState', orderRelevantState);
if (takerAddress === constants.NULL_ADDRESS) {
return orderRelevantState.remainingFillableTakerAssetAmount;
}
const takerAssetData = assetProxyUtils.decodeERC20ProxyData(signedOrder.takerAssetData);
const takerBalance = await this._erc20Wrapper.getBalanceAsync(takerAddress, takerAssetData.tokenAddress);
const takerAllowance = await this._erc20Wrapper.getProxyAllowanceAsync(
takerAddress,
takerAssetData.tokenAddress,
);
// TODO: We also need to make sure taker has sufficient ZRX for fees...
const fillableTakerAssetAmount = BigNumber.min([
takerBalance,
takerAllowance,
orderRelevantState.remainingFillableTakerAssetAmount,
]);
return fillableTakerAssetAmount;
}
}
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